Mine is behind the tranny hump cover -- two screws, one on each side near the front.

Usually mounts in a bracket.

May be in other locations on other cars, doesn't matter so long as you get the power wire and speaker wires attached,

A question of my own: Are these interchangeable? I've got a Becker Mexico with cassette I'd like to install, but the speaker wire connections are different. Can I use my old one (head unit long gone, cheapo Kenwood installed, cable butchered), or do I need to use the one that came with the Mexico?

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!